ZIP Code 21102 — Manchester, MD
21102 is a standard (street delivery) ZIP code serving Manchester, Maryland, in Carroll County. To mail something here you only need these five digits — but the four-digit extension narrows delivery to a single point, and it is what USPS bulk postage discounts are priced on.
ZIP code 21102 at a glance
| ZIP code | 21102 |
|---|---|
| Primary city | Manchester |
| State | Maryland (MD) |
| County | Carroll FIPS 24013 |
| ZIP type | Standard (street delivery) |
| Time zone | America/New_York |
| Population | 12,162 |
| Coordinates | 39.687320, -76.845640 |
How ZIP+4 works in 21102
The four digits after the hyphen encode a delivery segment inside 21102. In practice one segment usually means:
- One side of one block — odd numbers on a street between two cross streets
- A single large building, or one floor of it
- A group of PO boxes, sometimes a single box
- A single business that receives enough mail to warrant its own code
That is why 21102 has no single ZIP+4: two neighbors across the street from each other usually have different ones. Enter a street address above and we will return the exact nine-digit code along with the standardized USPS address format.
Nearby ZIP codes
Showing the closest twelve. See every ZIP code within 25 miles of 21102.
| ZIP | City | Distance |
|---|---|---|
| 21074 | Hampstead, MD | 4.8 mi |
| 17329 | Glenville, PA | 5.2 mi |
| 21053 | Freeland, MD | 6.9 mi |
| 17327 | Glen Rock, PA | 8 mi |
| 21155 | Upperco, MD | 8.2 mi |
| 17311 | Codorus, PA | 9 mi |
| 17355 | Railroad, PA | 9.4 mi |
| 21120 | Parkton, MD | 9.4 mi |
| 17349 | New Freedom, PA | 10 mi |
| 17331 | Hanover, PA | 10.1 mi |
| 21158 | Westminster, MD | 10.3 mi |
| 21105 | Maryland Line, MD | 10.4 mi |
Questions about 21102
What is the ZIP+4 code for 21102?
21102 is the five-digit ZIP code. The ZIP+4 adds four more digits that identify a specific delivery point — usually one side of a city block, a single building, or a group of PO boxes. Because those four digits change from address to address within 21102, you need to look up a specific street address to get them.
What city is 21102?
21102 is assigned to Manchester, Maryland, in Carroll County.
Do I need to use the ZIP+4?
It is optional for ordinary mail, but it speeds up sorting and it is required for most USPS bulk-mail postage discounts. Many address-verification and e-commerce systems also use ZIP+4 to confirm a delivery point exists.
Need thousands of these?
Upload a CSV and get ZIP+4, county, carrier route, and delivery-point data appended to every row — or call the API directly.